/***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Tilt: A WebGL-based 3D visualization of a webpage.
 *
 * The Initial Developer of the Original Code is The Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Victor Porof <victor.porof@gmail.com> (original author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the LGPL or the GPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 ***** END LICENSE BLOCK *****/
"use strict";

var Tilt = Tilt || {};
var EXPORTED_SYMBOLS = [
  "Tilt.$gl",
  "Tilt.$renderer",
  "Tilt.$activeShader",
  "Tilt.$enabledAttributes",
  "Tilt.$loadedTextures",
  "Tilt.clearCache"];

/* All cached variables begin with the $ sign, for easy spotting.
 * ------------------------------------------------------------------------ */

/**
 * The current active WebGL context.
 */
Tilt.$gl = null;

/**
 * The current active Tilt renderer.
 */
Tilt.$renderer = null;

/**
 * Represents the current active shader, identified by an id.
 */
Tilt.$activeShader = -1;

/**
 * Represents the current enabled attributes.
 */
Tilt.$enabledAttributes = -1;

/**
 * All the loaded textures, stored in a hash table.
 */
Tilt.$loadedTextures = {};

/**
 * Clears the cache and sets all the variables to default.
 */
Tilt.clearCache = function() {
  Tilt.destroyObject(Tilt.$gl);
  Tilt.destroyObject(Tilt.$renderer);
  Tilt.destroyObject(Tilt.$activeShader);
  Tilt.destroyObject(Tilt.$enabledAttributes);
  Tilt.destroyObject(Tilt.$loadedTextures);

  Tilt.$gl = null;
  Tilt.$renderer = null;
  Tilt.$activeShader = -1;
  Tilt.$enabledAttributes = -1;
  Tilt.$loadedTextures = {};

  Tilt.GLSL.$count = 0;
  Tilt.TextureUtils.$count = 0;
};
